Directory
Dr Mikhail FILATOV
| When |
Jun 29, 2022 à 10:30 AM |
|---|---|
| Where |
André Collet |
| Contact |
Alla Lemeune |
Photosensitizers with Charge Transfer-Mediated Intersystem Crossing: Design and Applications
Replacing transition metal-based photosensitizers with heavy-atom-free organic dyes has drawn considerable attention in recent years. The formation of triplet excited states in electron donor-acceptor molecules via the process of spin-orbit charge transfer intersystem crossing (SOCT-ISC) represents one of the most promising approaches for developing photosensitizers not relying on the heavy atom effect. Tuning the structural factors along with the effects of the environment allow to program triplet state and fluorescence quantum yields of such dyes for a specific application. In this lecture, molecular design principles for controlling SOCT-ISC will be introduced with a focus on the charge separation and charge recombination processes. This will be based on a case study of donor-acceptor and donor-acceptor-donor BODIPY dyes. A comparison of photophysical parameters, excited state dynamics and potential methods for predicting SOCT-ISC for a given structure will be performed.1-2 In the second half of the lecture, advances in applications of SOCT-ISC dyes will be highlighted. In particular, the use donor-acceptor BODIPYs with tailored optical characteristics for photodynamic therapy (PDT)3-4 and triplet-triplet annihilation upconversion (TTA-UC)5-6 will be presented. Furthermore, our recent results on incorporation of these novel photosensitizers in hybrid materials, such as photopolymerizalbe glass, and their ability to initiate photopolymerization under visible light irradiation thus allowing for holographic recording of diffractive structures will be discussed.
1. M.A. Filatov, S. Karuthedath, P.M. Polestshuk, S. Callaghan, K. Flanagan, M. Telitchko, T. Wiesner, F. Laquai, M.O. Senge, Phys. Chem. Chem. Phys., 2018, 20, 8016-8031.
2. A.A. Buglak, A. Charisiadis, A. Sheehan, C.J. Kingsbury, M.O. Senge, M.A. Filatov, Chem. Eur. J., 2021, 27, 9934-9947.
3. M.A. Filatov, S. Karuthedath, P.M. Polestshuk, H.Savoie, K.J. Flanagan, C. Sy, E. Sitte, M. Telitchko, F. Laquai, R.W. Boyle, M.O. Senge, J. Am. Chem. Soc., 2017, 139, 6282−6285.
4. S. Callaghan, M.A. Filatov, H. Savoie, R.W. Boyle, M.O. Senge, Photochem. Photobiol. Sci., 2019, 18, 495-504.
5. N. Kiseleva, M.A. Filatov, M. Oldenburg, D. Busko, M. Jakoby, I.A. Howard, B.S. Richards, M.O. Senge, S.M. Borisov, A. Turshatov, Chem. Commun., 2018, 54, 1607-1610.
6. N. Kiseleva, D. Busko, B.S. Richards, M.A. Filatov, A. Turshatov, J. Phys. Chem. Lett., 2020, 11, 6560-6566.